[Quiz] 3 switches and 3 bulbs

There are 3 switches in a downstair room and there are 3 bulbs in an upstair room.
How do you determine which switch is connected to which bulb by only going upstair room once?
You don't know the status of the bulbs on the downstair.

 

Turn on the first switch and the second switch and leave it on for a few minutes.
After some time, turn off the second switch go to the upstair room, and inspect the bulbs.

If one bulb is lit, it corresponds to the first switch.
If one bulb is off and feels warm, it corresponds to the second switch.
If one bulb is off and cold, it corresponds to the third switch.